JVC XV-M50BK Service Manual page 22

XV-M50BK
1.13 TC74VHC00FT-X (IC503) : Write timing control
• Terminal layout / Block diagram
1.14 TC74VHC125FT-X (IC411) : Buffer
• Terminal layout / Block diagram
1.15 TC7WT125FU-X(IC412) : Dual bus buffer
• Pin layout
22
• Truth table
A B Y
L L H
L H H
H L H
H H L
• Truth table
INPUTS OUTPUTS
G A Y
H X Z
L L L
L H H
X : Don't care
Y : High impedance
• Truth table
INPUTS OUTPUTS
G A Y
H X Z
L L L
L H H
X : Don't care
Y : High impedance